US7157869B2 - Control system and control method for motor powered four wheel drive vehicle - Google Patents
Control system and control method for motor powered four wheel drive vehicle Download PDFInfo
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- US7157869B2 US7157869B2 US10/986,357 US98635704A US7157869B2 US 7157869 B2 US7157869 B2 US 7157869B2 US 98635704 A US98635704 A US 98635704A US 7157869 B2 US7157869 B2 US 7157869B2
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- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
- B60K6/44—Series-parallel type
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
- B60K6/52—Driving a plurality of drive axles, e.g. four-wheel drive
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- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
- B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
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- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
- B60K2006/268—Electric drive motor starts the engine, i.e. used as starter motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
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- B60Y2400/11—Electric energy storages
- B60Y2400/114—Super-capacities
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
Definitions
- the present invention relates to a control system and a control method for controlling a four wheel drive (4WD) vehicle, in which either one of a pair of front wheels or a pair of rear wheels are driven by an engine and the other pair of wheels are driven by a motor.
- 4WD four wheel drive
- Japanese Patent Application Laid-open Publications No. 2002-152911 and 2002-200932 disclose a 4WD vehicle in which front wheels thereof are driven by an engine and rear wheels thereof are driven by a motor. Electric power to be supplied to the motor is generated by a power generator driven by the engine.
- the power generator for the motor is provided separately from a power generator for electric equipments of the vehicle. Accordingly, the number of parts/equipments is increased and spaces are wasted. Further, the weight and costs of the vehicle are increased.
- An object of the present invention is to provide a control system and a control method for controlling a motor powered 4WD vehicle, which provide a simplified system configuration.
- An aspect of the present invention is a control system for controlling a vehicle which has an engine for driving at least one of wheels thereof and a motor for driving at least one of the rest of the wheels thereof, the control system comprising: a motor generator configured to be driven by the engine for generating first alternating-current power at first voltage; an inverter which converts the first alternating-current power to second power at second voltage lower than the first voltage; a first battery to be charged with the second power supplied from the inverter; and a capacitor device connected to the inverter, wherein the motor is supplied with third power at third voltage converted from the first alternating-current power.
- FIG. 1 is a block diagram showing a configuration of a control system for a motor powered 4WD vehicle according to a first embodiment of the present invention.
- FIG. 2 is a flowchart showing an operation of the control system for a motor powered 4WD vehicle according to the first embodiment when starting an engine.
- FIG. 3 is a flowchart showing an operation of the control system for a motor powered 4WD vehicle according to the first embodiment when charging a 14-V battery.
- FIG. 4 is a flowchart showing an operation of the control system for a motor powered 4WD vehicle according to the first embodiment when charging an electric double layer capacitor.
- FIG. 5 is a flowchart showing an operation of the control system for a motor powered 4WD vehicle according to the first embodiment when driving a motor.
- FIG. 6 is a table for describing operation states of respective devices in the control system for a motor powered 4WD vehicle according to the first embodiment.
- FIG. 7 is a block diagram showing a configuration of a control system for a motor powered 4WD vehicle according to a second embodiment of the present invention.
- FIG. 8 is a table for describing operation states of respective devices in the control system for a motor powered 4WD vehicle according to the second embodiment.
- a control system CS 1 controls a vehicle, in which either one of a pair of front wheels or a pair of rear wheels are driven by an engine and the other pair of wheels are driven by a motor.
- the system CS 1 includes an engine 1 , a 42-V alternator (a motor generator) 2 which is connected to the engine 1 through a belt and generates three-phase alternating-current power at 42 V (a first rated voltage) by use of torque of the engine 1 , a 14-V battery E 1 (a first battery) for supplying electric power at 14 V (a second rated voltage) to various electric devices mounted on the vehicle, and a capacitor (an electric double layer capacitor (DLC); a capacitor device) C 1 for supplying driving force to the 42-V alternator 2 when starting the engine.
- DLC electric double layer capacitor
- the system CS 1 further includes a step-up and step-down inverter 3 .
- the step-up and step-down inverter 3 converts the three-phase alternating-current power outputted from the 42-V alternator 2 into direct-current power and thereby charges the capacitor C 1 up to a predetermined voltage, and supplies electric power for charging the 14-V battery E 1 .
- the step-up and step-down inverter 3 converts the direct-current power discharged from the capacitor C 1 into three-phase alternating-current power and increases voltage thereof.
- the three-phase alternating-current power is supplied to the 42-V alternator 2 .
- the 42-V alternator 2 includes a rotational position sensor 11 which detects a rotational position of the 42-V alternator 2 .
- the system CS 1 further includes a rectifier circuit 14 which converts the three-phase alternating-current power generated by the 42-V alternator 2 into direct-current power.
- the obtained direct-current power is supplied to a motor M 1 .
- An output shaft of the motor M 1 is connected to rear wheels 5 through a differential 4 .
- a differential 4 An example of driving the rear wheels 5 with the motor M 1 will be explained.
- the motor M 1 drives front wheels instead.
- the system CS 1 includes an engine controller 12 , a motor controller 9 for controlling the drive of the motor M 1 , and a drive/charge control circuit 6 .
- the engine controller 12 outputs an ignition signal to the engine 1 and controls an injector based on a detection signal of the revolution sensor 10 provided on the engine 1 and on a detection signal of an accelerator sensor (not shown).
- the drive/charge control circuit 6 controls the drive of the step-up and step-down inverter 3 and of the 42-V alternator 2 , and also controls the charge and discharge of the capacitor C 1 and the 14-V battery E 1 .
- a detection signal of a wheel speed sensor (not shown) and the detection signal of the accelerator sensor are inputted to the motor controller 9 .
- the motor controller 9 opens and closes a switch (a third switch) SW 3 provided between the rectifier circuit 14 and the motor M 1 , and also outputs a control signal to a field controller 13 for controlling a field current of the motor M 1 (a current flowing in a field coil).
- the 42-V alternator 2 is provided with a field controller 8 for controlling a field current of the 42-V alternator 2 .
- This field controller 8 is operated under control of the drive/charge control circuit 6 and the engine controller 12 .
- the step-up and step-down inverter 3 includes six switching elements Tr 1 to Tr 6 of insulated gate bipolar transistors (IGBTs), metal oxide semiconductor field effect transistors (MOS-FETs), or the like.
- a bus on a ground side of the step-up and step-down inverter 3 is connected to a negative terminal of the 14-V battery E 1 .
- a positive terminal of the 14-V battery E 1 is connected through a switch (a first switch) SW 1 to a neutral point of three-phase field coils of the 42-V alternator 2 .
- a voltage sensor 7 is provided for measuring the terminal voltage of the 14-V battery E 1 .
- a serial connection circuit of a switch (a second switch) SW 2 to be opened and closed under control of the drive/charge control circuit 6 and the capacitor C 1 is provided at subsequent stage to the step-up and step-down inverter 3 .
- a voltage sensor 15 for detecting the terminal voltage of the capacitor C 1 is connected in parallel with the capacitor C 1 .
- An operation signal of an accelerator switch SW 4 , detection signals of the voltage sensors 7 and 15 , and a detection signal of the rotational position sensor 11 are inputted to the drive/charge control circuit 6 .
- the drive/charge control circuit 6 Upon receipt of these signals, the drive/charge control circuit 6 outputs driving signals to control input terminals of the six switching elements Tr 1 to Tr 6 in the step-up and step-down inverter 3 . Further, the drive/charge control circuit 6 outputs control signals to the switch SW 1 and to the switch SW 2 for opening and closing the switches.
- the step-up and step-down inverter 3 by allowing the step-up and step-down inverter 3 to perform a powering operation while turning the switch SW 1 off and turning the switch SW 2 on under control of the drive/charge control circuit 6 and turning the switch SW 3 off under control of the motor controller 9 , it is possible to convert the direct-current power discharged from the capacitor C 1 into the three-phase alternating-current power, to use the 42-V alternator 2 as an electric motor, feeding this three-phase alternating-current power, and thereby to start the engine 1 .
- step-up and step-down inverter 3 by allowing the step-up and step-down inverter 3 to perform a regenerative operation by turning the switch SW 1 on, turning the switch SW 2 and the switch SW 3 off, and using the 42-V alternator 2 as a power generator, it is possible to rectify the three-phase alternating-current power generated by the 42-V alternator 2 and lower the voltage thereof, and to charge the 14-V battery E 1 with the direct-current power after lowering voltage and rectification.
- step-up and step-down inverter 3 by allowing the step-up and step-down inverter 3 to perform a regenerative operation by turning the switch SW 1 off, turning the switch SW 2 on, turning the switch SW 3 off, and using the 42-V alternator 2 as a power generator, it is possible to convert the three-phase alternating-current power generated by the 42-V alternator 2 into the direct-current power, and to charge the capacitor C 1 with this direct-current power.
- step-up and step-down inverter 3 by stopping the step-up and step-down inverter 3 while turning the switches SW 1 and SW 2 off and turning the switch SW 3 on, it is possible to rectify the three-phase alternating-current power generated by the 42-V alternator 2 using the rectifier circuit 14 .
- rectified power by supplying the rectified power to the motor M 1 , it is possible to power the motor M 1 and thereby to allow the vehicle to perform 4WD drive.
- FIG. 2 is a flowchart showing an operation process when starting the engine. Firstly, in Step S 1 , a judgment is made as to whether the terminal voltage of the capacitor C 1 (28 to 42 V) reaches a predetermined voltage (28 V) based on an output signal from the voltage sensor 15 .
- Step S 2 When the terminal voltage reaches the predetermined voltage, a judgment is made as to whether the accelerator switch SW 4 is on or not in Step S 2 .
- the accelerator switch SW 4 When the accelerator switch SW 4 is on, the switch SW 2 is turned on under control of the drive/charge control circuit 6 in Step S 3 .
- Step S 4 the step-up and step-down inverter 3 is allowed to perform the powering operation, whereby the three-phase alternating-current power (approximately 1 kW (kilowatts) at the maximum) at approximately 40 Vrms (root mean squared voltage) generated by the step-up and step-down inverter 3 is applied to the 42-V alternator 2 . Therefore, the 42-V alternator 2 operates as an electric motor and cranks the engine 1 . Simultaneously, the engine controller 12 outputs the ignition signal to the engine 1 and outputs a fuel injection signal to the injector. Accordingly, the engine 1 is completely ignited and started in Step S 5 . Thereafter, the drive of the step-up and step-down inverter 3 is stopped in Step S 6 , and the switch SW 2 is turned off in Step S 7 .
- Step S 1 when the judgment is made in Step S 1 that the terminal voltage of the capacitor C 1 does not reach the predetermined voltage (28V), the switches SW 1 and SW 2 are turned on in Steps S 8 and S 9 . Subsequently, the step-up and step-down inverter 3 is driven in Step S 10 . Accordingly, the voltage (14 V at the maximum) of the direct-current power (approximately 1 kW at the maximum) discharged from the 14-V battery E 1 is increased to 28 to 42 V, and the direct-current power (approximately 1 kW at the maximum) is supplied to the capacitor C 1 for charging the capacitor C 1 .
- Step S 11 the step-up and step-down inverter 3 is stopped, and the switches SW 1 and SW 2 are turned off in Steps S 12 and S 13 .
- the step-up and step-down inverter 3 is stopped, and the switches SW 1 and SW 2 are turned off in Steps S 12 and S 13 .
- Step S 21 a judgment is made as to whether the vehicle is in a 4WD mode, or in other words, whether the motor M 1 is in operation.
- the result of the judgment is NO in Step S 21 .
- Step S 22 a judgment is made as to whether the terminal voltage of the 14-V battery E 1 reaches the predetermined voltage based on the detection signal of the voltage sensor 7 . As a consequence, when the terminal voltage does not reach the predetermined voltage, the result of the judgment is NO in Step S 22 .
- the switch SW 1 is turned on in Step S 23 .
- step S 24 the field controller 8 performs the field control of the 42-V alternator 2 .
- Step S 25 the 14-V battery E 1 is charged with this electric power.
- Step S 21 when the judgment is made that the vehicle is in the 4WD mode in Step S 21 , the electric power generated by the 42-V alternator 2 is used for driving the motor M 1 , and it is not possible to charge the 14-V battery E 1 . Accordingly, the switch SW 1 is turned off in Step S 27 .
- Step S 22 when the judgment is made that the terminal voltage of the 14-V battery E 1 reaches the predetermined voltage in Step S 22 , a judgment is made as to whether the terminal voltage of the capacitor C 1 reaches a predetermined voltage in Step S 26 . When the terminal voltage does not reach the predetermined voltage, the result of the judgment is NO in Step S 26 . Then, an operation for charging the capacitor C 1 (to be described later) is carried out.
- Step S 26 the operation for charging the capacitor C 1 is carried out.
- the electric power discharged from the 14-V battery E 1 is used in the processing from Steps S 8 to S 13 shown in FIG. 2 , however, in this charging operation, the electric power to be used for charging is generated by the 42-V alternator 2 which is driven by the engine 1 .
- Step S 31 the switch SW 2 is turned on in Step S 31 shown in FIG. 4 .
- Step S 32 the electric power generated by the 42-V alternator 2 is rectified and the voltage thereof is lowered to 28 to 42 V by the step-up and step-down inverter 3 , and is supplied to the capacitor C 1 at approximately 1 kW at the maximum for charging the capacitor C 1 .
- Step S 33 a judgment is made as to whether the terminal voltage of the capacitor C 1 reaches the predetermined voltage based on the detection signal of the voltage sensor 15 .
- Step S 34 the switch SW 2 is turned off and the charging of the capacitor C 1 is completed.
- the charging of the capacitor C 1 is carried out on the condition that the vehicle is not in the 4WD mode (when not driving the motor) and that the charge of the 14-V battery E 1 is completed (when not charging the first battery). Accordingly, even when the terminal voltage of the capacitor C 1 falls off, it is possible to fully charge the capacitor C 1 quickly. In this way, it is possible to prepare for starting the engine.
- Step S 41 the motor controller 9 determines whether or not the 4WD drive is to be performed based on the detection signal of the wheel speed sensor and on the detection signal of the accelerator sensor.
- Step S 42 the drive/charge control circuit 6 outputs an instruction signal to the field controller 8 to apply a field current thereto. In this way, the field current of the 42-V alternator 2 becomes controllable.
- Step S 43 the switch SW 3 is turned on in Step S 43 . Accordingly, the electric power generated by the 42-V alternator 2 and rectified by the rectifier circuit 14 becomes feedable to the motor M 1 .
- Step S 44 the motor controller 9 outputs another instruction signal to the field controller 13 to apply a field current thereto. In this way, the field current of the motor M 1 becomes controllable.
- a shaft of the 42-V alternator 2 is rotated by use of the torque of the engine 1 and the 42-V alternator 2 is thereby operated as the power generator.
- the three-phase alternating-current power generated by the 42-V alternator 2 is rectified by the rectifier circuit 14 , and the electric power (approximately 4 kW at the maximum) at voltage of 16 to 60 V obtained by the rectification is fed to the motor M 1 , thereby powering the motor M 1 .
- the 4WD mode is thus achieved by driving the front wheels with the engine 1 and driving the rear wheels with the motor M 1 .
- control system CS 1 when driving the engine 1 , it is possible to rectify the electric power generated by the 42-V alternator 2 and lower the voltage thereof using the step-up and step-down inverter 3 , and thereby to charge the 14-V battery E 1 and the capacitor C 1 with the rectified power. Moreover, in the 4WD mode, it is possible to rectify the three-phase alternating-current power generated by the 42-V alternator 2 using the rectifier circuit 14 , to supply the rectified power to the motor M 1 for powering the motor M 1 .
- the 42-V alternator 2 it is possible to obtain both of the first rated voltage for driving the motor M 1 and the second rated voltage for charging the 14-V battery E 1 , to thereby supply the electric power to the motor M 1 and the 14-V battery E 1 , respectively. Accordingly, it is possible to simplify a system configuration, to provide flexibility in layout, and to reduce weight and cost.
- the motor generator is used commonly to supply the electric power to the motor in the 4WD mode and to supply the electric power when charging the first battery. Accordingly, it is possible to simplify the system configuration, to provide flexibility in layout, and to reduce weight and cost.
- step-up and step-down inverter 3 converts the three-phase alternating-current power generated by the 42-V alternator 2 into the direct-current power and thereby to charge the 14-V battery E 1 with the direct-current power. Accordingly, it is not necessary to prepare any other rectifier circuit to generate the charge power to the 14-V battery E 1 . In this way, it is possible to simplify the system configuration.
- the step-up and step-down inverter 3 converts the three-phase alternating-current power generated by the motor generator 2 into the direct-current power at a lowered voltage.
- the direct-current power is then supplied to the first battery for charging the first battery. Accordingly, it is not necessary to mount any other rectifier circuit. In this way, it is possible to simplify the system configuration.
- the electric power discharged from the capacitor C 1 is converted into a three-phase alternating voltage at the first rated voltage by use of the step-up and step-down inverter 3 , and this three-phase alternating power is supplied to the 42-V alternator 2 to rotate the shaft of the 42-V alternator 2 and thereby to start the engine 1 . Accordingly, no other power source is required. It is thus possible to simplify the system configuration.
- the electric power discharged from the capacitor device is converted into the three-phase alternating voltage at the first rated voltage by use of the step-up and step-down inverter 3 .
- the three-phase alternating power it is possible to rotate a shaft of the motor generator and thereby to start the engine. Accordingly, no other power source is required. In this way, it is possible to simplify the system configuration.
- the terminal voltage of the capacitor C 1 does not reach the predetermined voltage when starting the engine 1 , the voltage of the electric power discharged from the 14-V battery E 1 is increased by the step-up and step-down inverter 3 and the electric power at the increased voltage is supplied to the capacitor C 1 for charging the capacitor C 1 . Thereafter, the engine 1 is started by use of the power discharged from the capacitor C 1 . Accordingly, it is possible to ensure starting the engine 1 even in a case that the terminal voltage of the capacitor C 1 is low.
- the capacitor device if the terminal voltage of the capacitor device does not reach the predetermined voltage when starting the engine, the capacitor device is charged to have the predetermined voltage with the electric power discharged from the first battery. Accordingly, it is possible to ensure starting the engine even in a case that the terminal voltage of the capacitor C 1 is low.
- the accelerator switch SW 4 when the accelerator switch SW 4 is tuned on, the engine 1 is started, being fed with the electric power discharged from the capacitor C 1 . Accordingly, it is possible to realize an idle stop operation in which the engine is temporarily stopped only while the vehicle is not in motion, thereby improving gas mileage.
- the engine is started when a predetermined condition is satisfied, or for example, when it is detected that the accelerator switch is turned on. Accordingly, it is possible to realize the idle stop operation, thereby improving gas mileage.
- the three-phase alternating-current power generated by the 42-V alternator 2 is rectified by use of the rectifier circuit 14 , and the rectified power is supplied to the motor M 1 . Accordingly, it is possible to obtain the direct-current power for driving the motor M 1 without using the step-up and step-down inverter 3 .
- the three-phase alternating-current power generated by the motor generator is rectified by use of the rectifier circuit 14 , and this power is supplied to the motor. Accordingly, it is possible to obtain the direct-current power for driving the motor without using the step-up and step-down inverter.
- the capacitor C 1 is charged when the motor M 1 is not powered and when the 14-V battery E 1 is not charged. Accordingly, even when the terminal voltage of the capacitor C 1 falls off, it is possible to increase the terminal voltage quickly and thereby to prepare for starting the engine 1 next time.
- the capacitor device is charged when not driving the motor and when not charging the first battery. Accordingly, it is possible to keep the terminal voltage of the capacitor device equal to or above the predetermined voltage at any time and get the system ready for starting the engine.
- control system includes the switches SW 1 , SW 2 , and SW 3 .
- the first switch, the second switch, and the third switch by using the first switch, the second switch, and the third switch, and by opening and closing these switches appropriately, it is possible to switch the start of the engine, the charging of the first battery, the charging of the capacitor device, and the drive of the motor. Accordingly, it is possible to ensure the switching operations and thereby to improve reliability of the operations.
- FIG. 6 is a block diagram showing a configuration of a control system CS 2 for a motor powered 4WD vehicle according to the second embodiment.
- the control system CS 2 includes the engine 1 , the 42-V alternator (the motor generator) 2 , the step-up and step-down inverter 3 , the 14-V battery E 1 , the motor controller 9 , the field controller 8 , the drive/charge control circuit 6 , the engine controller 12 , the revolution sensor 10 , the rotational position sensor 11 , the voltage sensor 7 , and the switch (the first switch) SW 1 as similar to the above-described first embodiment.
- a serial connection circuit of the switch (the second switch) SW 2 and a 42-V battery (a second battery: a capacitor device) E 2 is provided at subsequent stage to the step-up and step-down inverter 3 .
- the system CS 2 includes a voltage sensor 16 for detecting the terminal voltage of the 42-V battery E 2 .
- an H-bridge circuit 18 including four switching elements Tr 11 to Tr 14 is provided at subsequent stage to the serial connection circuit composed of the switch SW 2 and the 42-V battery E 2 .
- a permanent magnet direct-current motor M 2 is provided at subsequent stage to the H-bridge circuit 18 .
- the motor M 2 is connected to the rear wheels 5 through the differential 4 as similar to the above-described first embodiment.
- the system CS 2 further includes a drive circuit 17 for controlling on and off operations of the respective switching elements Tr 11 to Tr 14 in the H-bridge circuit 18 .
- a drive circuit 17 for controlling on and off operations of the respective switching elements Tr 11 to Tr 14 in the H-bridge circuit 18 .
- the drive/charge control circuit 6 starts the engine 1 when detecting that the accelerator switch SW 4 is turned on.
- the switch SW 2 is turned on and the switch SW 1 is turned off.
- the H-bridge circuit 18 is set to an off-state.
- the direct-current power discharged from the 42-V battery E 2 is supplied to the step-up and step-down inverter 3 , and the step-up and step-down inverter 3 converts the direct-current power at 42 V into the three-phase alternating-current power. Then, this three-phase alternating-current power is supplied to the 42-V alternator 2 . Accordingly, the 42-V alternator 2 's shaft is rotated, functioning as a motor. By use of the torque thereof, the engine 1 is started.
- an operation for charging the 42-V battery E 2 is carried out by use of the electric power discharged from the 14-V battery E 1 .
- the switch SW 1 is turned on, and the voltage of the direct-current power discharged from the 14-V battery E 1 is increased by the step-up and step-down inverter 3 .
- the 42-V battery E 2 is charged with this electric power.
- the above-described operation is carried out to start the engine 1 .
- the switch SW 1 is turned on and the switch SW 2 is turned off.
- the electric power generated by the 42-V alternator 2 is rectified and the voltage thereof is lowered by the step-up and step-down inverter 3 .
- the electric power thus stepped down and rectified is supplied to the 14-V battery E 1 for charging the 14-V battery E 1 .
- the switch SW 1 is turned off and the switch SW 2 is turned on. In this state, the electric power generated by the 42-V alternator 2 is rectified and supplied to the 42-V battery E 2 . In this way, it is possible to charge the 42-V battery E 2 until the terminal voltage thereof reaches the predetermined voltage.
- the switches SW 1 and SW 2 are turned off.
- the on and off states of the respective switching elements Tr 11 to Tr 14 in the H-bridge circuit 18 are controlled by the drive circuit 17 .
- the electric power discharged from the 42-V battery E 2 is converted into the electric power at the predetermined voltage, which is supplied to the motor M 2 . Accordingly, the rear wheels 5 are driven to rotate, achieving the 4WD operation.
- the switch SW 2 when charging the 42-V battery E 2 , the switch SW 2 is turned on and the switch SW 1 is turned off. In this state, the three-phase alternating-current power generated by the 42-V alternator 2 is rectified by the step-up and step-down inverter 3 , and the rectified power is supplied to the 42-V battery E 2 . In this way, it is possible to charge the 42-V battery E 2 .
- control system CS 2 for a motor powered 4WD vehicle when driving the engine 1 , it is possible to rectify the electric power generated by the 42-V alternator 2 and lower the voltage thereof using the step-up and step-down inverter 3 , and thereby to charge the 14-V battery E 1 and the 42-V battery E 2 similarly to the above-described first embodiment.
- the 42-V alternator 2 it is possible to obtain both the first rated voltage for driving the motor M 2 and the second rated voltage for charging the 14-V battery E 1 , and to supply the electric power respectively to the motor M 2 and to the 14-V battery E 1 . Accordingly, it is possible to simplify a system configuration, to provide flexibility in layout, and to reduce weight and cost.
- step-up and step-down inverter 3 converts the three-phase alternating-current power generated by the 42-V alternator 2 into the direct-current power which is supplied to the 14-V battery E 1 for charging the 14-V battery E 1 and also supplied to the motor M 2 for driving the motor M 2 .
- the electric power discharged from the 42-V battery E 2 is converted into a three-phase alternating voltage at the first rated voltage by use of the step-up and step-down inverter 3 , and this three-phase alternating voltage is supplied to the 42-V alternator 2 to rotate the 42-V alternator 2 ′ shaft and thereby to start the engine 1 . Accordingly, no other power source is required. In this way, it is possible to simplify the system configuration.
- the voltage of the electric power discharged from the 14-V battery E 1 is increased by the step-up and step-down inverter 3 and the electric power at the increased voltage is supplied to the 42-V battery E 2 for charging the 42-V battery E 2 .
- the engine 1 is started by use of the power discharged from the 42-V battery E 2 . Accordingly, it is possible to ensure that the engine 1 starts even in the case that the terminal voltage of the 42-V battery E 2 is low.
- the accelerator switch SW 4 when the accelerator switch SW 4 is turned on, the engine 1 is started by use of the electric power discharged from the 42-V battery E 2 . Accordingly, it is possible to realize the idle stop operation, thus improving gas mileage.
- the 42-V battery E 2 is charged when the motor M 2 is not driven and when charging of the 14-V battery E 1 is not conducted. Accordingly, even when the terminal voltage of the 42-V battery E 2 drops off, it is possible to increase the terminal voltage thereof quickly and thereby to get ready for starting the engine 1 at any time.
- control system includes the switches SW 1 and SW 2 .
- the start of the engine 1 , the charge of the 14-V battery E 1 , the charge of the 42-V battery E 2 , and the drive of the motor M 2 are switched by opening and closing the respective switches. Accordingly, it is possible to ensure the smooth and safe switching operations, thereby improving reliability of the operations.
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003384958A JP4063199B2 (ja) | 2003-11-14 | 2003-11-14 | モータ駆動4wd車両の制御装置 |
JP2003-384958 | 2003-11-14 |
Publications (2)
Publication Number | Publication Date |
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US20050104544A1 US20050104544A1 (en) | 2005-05-19 |
US7157869B2 true US7157869B2 (en) | 2007-01-02 |
Family
ID=34431495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/986,357 Expired - Fee Related US7157869B2 (en) | 2003-11-14 | 2004-11-12 | Control system and control method for motor powered four wheel drive vehicle |
Country Status (6)
Country | Link |
---|---|
US (1) | US7157869B2 (zh) |
EP (1) | EP1531078B1 (zh) |
JP (1) | JP4063199B2 (zh) |
KR (1) | KR100629221B1 (zh) |
CN (1) | CN100341724C (zh) |
DE (1) | DE602004028329D1 (zh) |
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Also Published As
Publication number | Publication date |
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KR100629221B1 (ko) | 2006-09-27 |
EP1531078A2 (en) | 2005-05-18 |
JP4063199B2 (ja) | 2008-03-19 |
CN100341724C (zh) | 2007-10-10 |
JP2005151685A (ja) | 2005-06-09 |
CN1618652A (zh) | 2005-05-25 |
US20050104544A1 (en) | 2005-05-19 |
EP1531078B1 (en) | 2010-07-28 |
KR20050046637A (ko) | 2005-05-18 |
EP1531078A3 (en) | 2006-07-05 |
DE602004028329D1 (de) | 2010-09-09 |
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